US20180268194A1 - Biometric identification module - Google Patents
Biometric identification module Download PDFInfo
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- US20180268194A1 US20180268194A1 US15/960,518 US201815960518A US2018268194A1 US 20180268194 A1 US20180268194 A1 US 20180268194A1 US 201815960518 A US201815960518 A US 201815960518A US 2018268194 A1 US2018268194 A1 US 2018268194A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- G06K9/00046—
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/147—Details of sensors, e.g. sensor lenses
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0026—Wavelength selective element, sheet or layer, e.g. filter or grating
Definitions
- the invention relates to an identification module, and more particularly, to a biometric identification module.
- fingerprint recognition has been the mainstream technique in biometrics and is extensively applied in various mobile apparatuses, in particular apparatuses having a display screen such as smart phones and tablet computers.
- the current user demand for display screen size is increasing, and a narrow-frame or even frameless display apparatus is expected, which inevitably affects the space of the fingerprint recognition device on the apparatus. Therefore, in order to provide a fingerprint recognition device in a full-size screen, an optical fingerprint recognition technique in which a fingerprint sensing device is disposed below the display device has been proposed.
- a light-emitting device is required to sense fingerprints, but since the light-emitting device is disposed below the display screen, the light-emitting device needs to be adjusted to high intensity to transmit a light beam with sufficient light intensity to the finger.
- the light intensity of the light-emitting device is high and the light distribution is overly-concentrated, hot spots readily occur to the fingerprint image obtained by the image-capture device, such that the function of fingerprint recognition is substantially compromised.
- the invention provides a biometric identification module having good performance.
- a biometric identification module of the invention includes a light source, a cover plate, a display device, an image-capture device, and a first optical film layer.
- the light source is configured to emit a light beam.
- the cover plate has a first region and a second region outside the first region, wherein the light source is located adjacent to the first region of the cover plate.
- the image-capture device is disposed on the first region of the cover plate and located between the first region of the cover plate and the light source.
- the light beam emitted by the light source passes through the first optical film layer to be sequentially transmitted in the first region and the second region of the cover plate, and a finger disposed on the second region of the cover plate reflects the light beam from the second region of the cover plate.
- the light beam reflected by the finger sequentially passes through the second region of the cover plate and the display device to be received by the image-capture device.
- the cover plate has a first surface to be pressed by a finger and a second surface opposite to the first surface, and the first optical film layer is disposed on the second surface of the first region of the cover plate.
- the biometric identification module further includes a second optical film layer overlapped with the second region of the cover plate and located between the display device and the image-capture device.
- a first angle is between the light beam reflected by the finger and passing through the display device that does not enter the second optical film layer and a normal of a light-receiving surface of the image-capture device
- a second angle is between the light beam reflected by the finger and passing through the display device and the second optical film layer and the normal of the light-receiving surface of the image-capture device, and the second angle is less than the first angle.
- the biometric identification module further includes a light-collimating layer located between the second optical film layer and the image-capture device.
- the biometric identification module further includes a filter layer located between the second optical film layer and the light-collimating layer.
- the biometric identification module further includes a light-controlling device located between the first optical film layer and the light source.
- the biometric identification module further includes a light guide layer disposed on the first region and the second region of the cover plate and disposed between the cover plate and the display device.
- the first optical film layer is disposed on the light guide layer, and a portion of the light guide layer is located between the first region of the cover plate and the first optical film layer.
- the third optical film layer is disposed on the light guide layer and located between the second region of the cover plate and the light guide layer, wherein the light beam sequentially passes through the first optical film layer located on the first region of the cover plate, is transmitted to the third optical film layer located on the second region of the cover plate via the light guide layer, passes through the third optical film layer, enters the second region of the cover plate, and is reflected by the finger disposed on the second region of the cover plate.
- the first optical film layer and the third optical film layer are spaced apart by a distance, and the first optical film layer to the third optical film layer are formed by a plurality of microstructures.
- FIG. 1 is a cross section of a biometric identification module according to an embodiment of the invention.
- FIG. 2 is a cross section of a biometric identification module according to an embodiment of the invention.
- FIG. 3 is a cross section of a biometric identification module according to another embodiment of the invention.
- FIG. 4 is a cross section of a biometric identification module of another embodiment shown on the basis of yet another embodiment of the invention.
- FIG. 5 is a cross section of a biometric identification module according to still yet an embodiment of the invention.
- FIG. 6 is a cross section of a biometric identification module according to an embodiment of the invention.
- FIG. 7 is a cross section of a biometric identification module according to an embodiment of the invention.
- FIG. 8 is a cross section of a biometric identification module according to an embodiment of the invention.
- FIG. 9 is a cross section of a biometric identification module according to another embodiment of the invention.
- FIG. 10 is a cross section of a biometric identification module according to yet another embodiment of the invention.
- FIG. 11 is a cross section of a biometric identification module according to an embodiment of the invention.
- FIG. 12 is a cross section of a biometric identification module according to another embodiment of the invention.
- FIG. 13 is a cross section of a biometric identification module according to yet another embodiment of the invention.
- FIG. 14 is a cross section of a biometric identification module according to still yet another embodiment of the invention.
- FIG. 1 is a cross section of a configuration of the biometric identification module according to the first embodiment of the invention.
- a biometric identification module 100 is suitable for capturing the biometrics of an analyte F.
- the analyte F is, for instance, a finger
- the biometrics are, for instance, a fingerprint or a vein, but the invention is not limited thereto.
- the analyte F can also be a palm
- the biometrics can be a fingerprint, and the invention is not limited in this regard.
- the biometric identification module 100 includes a light source 110 , a cover plate 120 , a display device 130 , an image-capture device 140 , a first optical film layer MS 1 , and a second optical film layer MS 2 .
- the light source 110 is configured to emit a light beam L, and in the present embodiment, the light beam L emitted by the light source 110 can be visible light beam, invisible light beam, or a combination thereof.
- the cover plate 120 has a first region R 1 and a second region R 2 outside the first region R 1 .
- the second region R 2 of the cover plate 120 refers to the region of the cover plate 120 overlapped with the display device 130 .
- the first region R 1 of the cover plate 120 can refer to the region of the cover plate 120 not overlapped with the display device 130 , and the light source 110 is located adjacent to the first region R 1 of the cover plate 120 .
- the second region R 2 is used as a touch region touched by a finger F, and the first region R 1 is located in the periphery of the touch region.
- the cover plate 120 has a first surface 122 to be pressed by the finger F and a second surface 124 opposite to the first surface 122 .
- the material of the cover plate 120 can be glass, and the cover plate 120 can be referred to as a cover glass.
- the invention is not limited thereto, and in other exemplary embodiments, the material of the cover plate 120 can also be other suitable materials having high transmittance resistant to pressing.
- the display device 130 is overlapped with the second region R 2 of the cover plate 120 .
- the display panel 130 is disposed below the cover plate 120 and located between the second region R 2 of the cover plate 120 and the image-capture device 140 .
- the display device 130 can include a first substrate 130 a, a second substrate 130 b, and a display medium layer 132 , wherein the display medium layer 132 is disposed between the first substrate 130 a and the second substrate 130 b.
- the display medium layer 132 can be an organic light-emitting diode (OLED) layer or a liquid crystal layer
- the display device 130 is, for instance, an OLED or a liquid crystal display (LCD).
- the invention is not limited thereto, and according to other exemplary embodiments, the display device 130 can also be other suitable types of display.
- the first optical film layer MS 1 is disposed on the first region R 1 of the cover plate 120 and located between the first region R 1 of the cover plate 120 and the light source 110 .
- the first optical film layer MS 1 can be an optical film layer disposed on the second surface 124 of the cover plate 120 .
- the invention is not limited thereto, and according to other embodiments, the first optical film layer MS 1 can also be formed on the second surface 124 of the cover plate 120 ; in other words, in other exemplary embodiments, the first optical film layer MS 1 and the cover plate 120 can also be integrally-formed.
- the first optical film layer MS 1 is configured to guide the light beam L emitted by the light source 110 to be transmitted toward a specific direction such that most of the light beam L passing through the first optical film layer MS and entering the first region R 1 of the cover plate 120 can be totally reflected by the first surface 122 and be transmitted from the first region R 1 of the cover plate 120 toward the second region R 2 of the cover plate 120 . Accordingly, the light beam L emitted by the light source 110 can be uniformly dispersed on the first surface 122 (i.e., the pressing surface) of the second region R 2 to alleviate the issue of hot spots caused by overly-concentrated distribution of the light beam irradiated on the pressing surface in the prior art.
- the biometric identification module 100 can further include a second optical film layer MS 2 .
- the second optical film layer MS 2 is overlapped with the second region R 2 of the cover plate 120 and located between the display device 130 and the image-capture device 140 .
- the second optical film layer MS 2 can be disposed on an outer surface of the second substrate 130 b of the display device 130 , but the invention is not limited thereto.
- the second optical film layer MS 2 has the function of changing the transmission direction of the light beam L. Specifically, a first angle ⁇ is between the light beam L reflected by the finger F and passing through the display device 130 that does not enter the second optical film layer MS 2 and a normal N of a light-receiving surface 142 of the image-capture device 140 , a second angle ⁇ is between the light beam L reflected by the finger F and passing through the display device 130 and the second optical film layer MS 2 and the normal N of the light-receiving surface 142 of the image-capture device 140 , and the second angle ⁇ is less than the first angle ⁇ .
- the image-capture device 140 can obtain a clearer fingerprint image to facilitate fingerprint recognition.
- FIG. 2 is a cross section of a biometric identification module according to an exemplary embodiment of the invention.
- the biometric identification module 100 shown in FIG. 2 is the biometric identification module 100 shown in FIG. 1 , but FIG. 2 shows a specific first optical film layer MS 1 and second optical film layer MS 2 of an embodiment.
- the first optical film layer MS 1 and/or the second optical film layer MS 2 can be a plurality of prisms.
- the invention is not limited thereto, and in other embodiments, the first optical film layer MS 1 and/or the second optical film layer MS 2 can also be a plurality of semi-cylinders or other suitable forms of optical microstructures.
- FIG. 3 is a cross section of a biometric identification module according to another embodiment of the invention.
- a biometric identification module 100 A of FIG. 3 is similar to the biometric identification module 100 of FIG. 1 , and the main difference between the two is that the biometric identification module 100 A further includes a light-collimating layer 150 and a filter layer 160 .
- the light-collimating layer 150 is located between the second optical film layer MS 2 and the image-capture device 140 .
- the filter layer 160 is located between the second optical film layer MS 2 and the light-collimating layer 150 .
- the light-collimating layer 150 is configured to transmit the light beam L reflected by the finger F toward the image-capture device 140 in a collimated manner to increase the quality of the fingerprint image obtained by the image-capture device 140 .
- the light-collimating layer 150 is, for instance, a collimator having a plurality of pinholes, gratings, or fibers, but the invention is not limited thereto.
- the filter layer 160 is configured to filter out ambient light outside the wavelength range of the light beam L.
- the light beam L is, for instance, infrared
- the filter layer 160 can be an IR pass filter layer.
- the invention is not limited thereto, and according to other embodiments, the filter layer 160 an also be other types of filter layers.
- FIG. 4 is a cross section of a biometric identification module according to yet another exemplary embodiment of the invention.
- a biometric identification module 100 B of FIG. 4 is similar to the biometric identification module 100 A of FIG. 3 , and the main difference between the two is that in the biometric identification module 100 B of FIG. 3 , the filter layer 160 can be located between the second optical film layer MS 2 and the light-collimating layer 150 .
- FIG. 5 is a cross section of a biometric identification module according to still yet an embodiment of the invention.
- a biometric identification module 100 C of FIG. 5 is similar to the biometric identification module 100 of FIG. 1 , and the main difference between the two is that the biometric identification module 100 C further includes a light-controlling device 170 .
- the light source 170 is located between the first optical film layer MS 1 and the light source 110 .
- the light beam L emitted by the light source 110 passes through the light-controlling device 170 and enters the first optical film layer MS 1 at a predetermined incident angle.
- the light-controlling device 170 is, for instance, a fiber, but the invention is not limited thereto.
- the refractive index between the second optical film layer MS 2 and the image-capture device 140 is greater than or equal to 1.
- FIG. 6 is a cross section of a biometric identification module according to an embodiment of the invention.
- a biometric identification module 100 D of FIG. 6 is similar to the biometric identification module 100 A of FIG. 3 , and the main difference between the two is that the biometric identification module 100 D further has a transparent conductive layer 180 , the transparent conductive layer 180 is located between the cover plate 120 and the display panel 130 , and an air gap can be optionally between the second optical film layer MS 2 and the light-collimating layer 150 .
- the transparent conductive layer 180 is, for instance, a touch electrode, and can be formed by a single film layer or a plurality of film layers and have a patterned electrode.
- the refractive index of the transparent conductive layer 180 and the refractive index of an adjacent component can match (such as substantially the same) such that the transmission direction of the light beam L is not readily excessively changed by passing through the transparent conductive layer 180 .
- the refractive index between the second optical film layer MS 2 and the light-collimating layer 150 is greater than or equal to 1.
- FIG. 7 is a cross section of a biometric identification module according to an exemplary embodiment of the invention.
- the biometric identification module 200 includes a light source 210 , a cover plate 220 , a display device 230 , an image-capture device 240 , a light guide layer 290 , a first optical film layer MS 1 , and a third optical film layer MS 3 .
- the cover plate 220 has a first region R 1 and a second region R 2 outside the first region R 1 , wherein the light source 210 is located adjacent to the first region R 1 of the cover plate 220 .
- the cover plate 220 has a first surface 222 to be pressed by the finger F and a second surface 224 opposite to the first surface 222 .
- the light guide layer 290 is located in the first region R 1 and the second region R 2 and located on the second surface 224 .
- the display device 230 is overlapped with the second region R 2 of the cover plate 220 .
- the display device 230 can include a first substrate 230 a, a second substrate 230 b, and a display medium layer 232 , wherein the display medium layer 232 is disposed between the first substrate 230 a and the second substrate 230 b.
- the display device 230 is located in the second region R 2 of the cover plate 220 and located between the light guide layer 290 and the image-capture device 240 .
- the first optical film layer MS 1 is disposed in the first region R 1 of the cover plate 220 and located between the light guide layer 290 and the light source 210 .
- the third optical film layer MS 3 is located in the second region R 2 of the cover plate 220 and located between the cover plate 220 and the light guide layer 290 .
- the first optical film layer MS 1 and the third optical film layer MS 3 are spaced apart by a distance d, and the first optical film layer MS 1 and the third optical film layer MS 3 are not overlapped.
- the light beam L emitted by the light source 210 passes through the first optical film layer MS 1 to enter a portion of the light guide layer 290 located in the first region R 1 ; the light beam L entering a portion of the light guide layer 290 located in the first region R 1 can be totally reflected by the interface of the cover plate 220 and the light guide layer 290 (i.e., the second surface 224 ) to be transmitted from a portion of the light guide layer 290 located in the first region R 1 to another portion of the light guide layer 290 located in the second region R 2 .
- the light beam L When the light beam L is transmitted to the surface of the third optical film layer MS 3 located in the second region R 2 , total reflection is compromised, and the light beam L can pass through the third optical film layer MS 3 to be transmitted to the finger F located on the second region R 2 of the cover plate 220 .
- the finger F reflects the light beam L from the second region R 2 of the cover plate 220 .
- the light beam L reflected by the finger F sequentially passes through the second region R 2 of the cover plate 220 , the light guide layer 290 , and the display device 230 , and is lastly received by the image-capture device 240 .
- the light guide layer 290 has a high refractive index.
- the refractive index of the light guide layer 290 is greater than the refractive index of the cover plate 220 and the refractive index of the first substrate 230 a of the display device 130 . Accordingly, the light beam L can be totally reflected by the interface of the light guide layer 290 and the cover plate 220 and the interface of the light guide layer 290 and the display device 230 to be transmitted from a portion of the light guide layer 290 located in the first region R 1 to another portion of the light guide layer 290 located in the second region R 2 and be emitted from the place from the location of the third optical film layer MS 3 .
- the light guide layer 290 can be at least one continuous translucent electrode of a touch sensing structure, but the invention is not limited thereto.
- the biometric identification module 200 of the present embodiment guides the light beam L emitted by the light source 210 to the second region R 2 of the cover plate 220 using the light guide layer 290 located below the cover plate 220 such that the light beam L is uniformly irradiated on the finger F.
- the biometric identification module 200 of the present embodiment can prevent dirt on the first surface 222 of the cover plate 220 or damage of the first surface 222 from affecting the amount of the light beam L transmitted to the second region R 2 . Therefore, in comparison to the embodiment of FIG. 1 , in addition to improving the issue of hot spots, the biometric identification module 200 of the present embodiment also has the advantage of good light utilization efficiency.
- FIG. 8 is a cross section of a biometric identification module according to an embodiment of the invention.
- the biometric identification module 100 shown in FIG. 8 is the biometric identification module 200 shown in FIG. 7 , but FIG. 8 shows a specific first optical film layer MS 1 and third optical film layer MS 3 of an embodiment.
- the first optical film layer MS 1 and/or the third optical film layer MS 3 can be a plurality of prisms.
- the invention is not limited thereto, and in other exemplary embodiments, the first optical film layer MS 1 and/or the third optical film layer MS 3 can also be a plurality of semi-cylinders or other suitable forms of optical microstructures.
- FIG. 9 is a cross section of a biometric identification module according to another embodiment of the invention.
- a biometric identification module 200 A of FIG. 9 is similar to the biometric identification module 200 of FIG. 7 , and the main difference between the two is that the biometric identification module 200 A further includes a second optical film layer MS 2 located in the second region R 2 of the cover plate 220 and located between the display device 230 and the image-capture device 240 .
- the refractive index between the second optical film layer MS 2 and the image-capture device 240 is greater than or equal to 1.
- FIG. 10 is a cross section of a biometric identification module according to yet another exemplary embodiment of the invention.
- a biometric identification module 200 B of FIG. 10 is similar to the biometric identification module 200 of FIG. 7 , and the main difference between the two is that the biometric identification module 200 B further includes a light-collimating layer 250 , a filter layer 260 , and an adhesive layer AD.
- the light-collimating layer 250 is located between the display device 230 and the filter layer 260
- the filter layer 260 is located between the light-collimating layer 250 and the image-capture device 240 .
- the adhesive layer AD is located between the filter layer 260 and the image-capture device 240 .
- the filter layer 260 can be fixed on the image-capture device 240 using the adhesive layer AD.
- the adhesive 260 can be, for instance, an optically-clear adhesive (OCA), an optically-clear resin (OCR), or a thermal adhesive, but the invention is not limited thereto.
- FIG. 11 is a cross section of a biometric identification module according to an exemplary embodiment of the invention.
- a biometric identification module 200 C includes a light source 210 , a cover plate 220 , a display device 230 , an image-capture device 240 , a light guide layer 290 , a first optical film layer MS 1 , and a third optical film layer MS 3 .
- the cover plate 220 has a first region R 1 and a second region R 2 outside the first region R 1 , wherein the light source 210 is located adjacent to the first region R 1 of the cover plate 220 .
- the cover plate 220 has a first surface 222 to be pressed by the finger F and a second surface 224 opposite to the first surface 222 .
- the display device 230 is located in the first region R 1 and the second region R 2 of the cover plate 220 .
- the display device 230 can include a first substrate 230 a, a second substrate 230 b, and a display medium layer 232 , wherein the display medium layer 232 is disposed between the first substrate 230 a and the second substrate 230 b.
- the light guide layer 290 is located in the first region R 1 and the second region R 2 of the cover plate 220 , and the display device 230 is located between the cover plate 220 and the light guide layer 290 .
- the first optical film layer MS 1 is disposed in the first region R 1 of the cover plate 220 and located between the light guide layer 290 and the light source 210 .
- the third optical film layer MS 3 is located in the second region R 2 of the cover plate 220 and located between the display device 230 and the light guide layer 290 .
- the first optical film layer MS 1 and the third optical film layer MS 3 are spaced apart by a distance d, and the first optical film layer MS 1 and the third optical film layer MS 3 are not overlapped.
- the light beam L emitted by the light source 210 passes through the first optical film layer MS 1 to enter a portion of the light guide layer 290 located in the first region R 1 .
- the light beam L entering a portion of the light guide layer 290 located in the first region R 1 can be totally reflected by the interface of the second substrate 230 b and the light guide layer 290 to be transmitted from a portion of the light guide layer 290 located in the first region R 1 to another portion of the light guide layer 290 located in the second region R 2 .
- the light beam L When the light beam L is transmitted to the surface of the third optical film layer MS 3 located in the second region R 2 , total reflection is compromised, and the light beam L can pass through the third optical film layer MS 3 and the display device 230 to be transmitted to the finger F located on the second region R 2 of the cover plate 220 .
- the finger F reflects the light beam L from the second region R 2 of the cover plate 220 .
- the light beam L reflected by the finger F sequentially passes through the second region R 2 of the cover plate 220 , the display device 230 , and the light guide layer 290 , and is lastly received by the image-capture device 240 .
- the light guide layer 290 has a high refractive index.
- the refractive index of the light guide layer 290 is greater than the refractive indices of the second substrate 230 b of the display device 230 and an environmental media (such as air).
- the light beam L can be totally reflected by the interface of the light guide layer 290 and the interface of the second substrate 230 b and the light guide layer 290 and an environmental medium (such as air) to be transmitted from a portion of the light guide layer 290 located in the first region R 1 to another portion of the light guide layer 290 located in the second region R 2 and be emitted from the place from the location of the third optical film layer MS 3 .
- the light guide layer 290 can be one continuous translucent electrode of a touch sensing structure, but the invention is not limited thereto.
- FIG. 12 is a cross section of a biometric identification module of another exemplary embodiment of the invention.
- a biometric identification module 200 D of FIG. 12 is similar to the biometric identification module 200 C of FIG. 11 , and the main difference between the two is that the biometric identification module 200 D further includes a second optical film layer MS 2 located in the second region R 2 of the cover plate 220 and located between the display device 230 and the image-capture device 240 .
- FIG. 13 is a cross section of a biometric identification module of yet another exemplary embodiment of the invention.
- a biometric identification module 200 E of FIG. 13 is similar to the biometric identification module 200 C of FIG. 11 , and the main difference between the two is that the biometric identification module 200 E further includes a light-collimating layer 250 and a filter layer 260 .
- the light-collimating layer 250 is in the second region R 2 of the cover plate 220 and located between the light guide layer 290 and the filter layer 260
- the filter layer 260 is located between the light-collimating layer 250 and the image-capture device 240 .
- the refractive index between the filter layer 260 and the image-capture device 240 is greater than or equal to 1.
- FIG. 14 is a cross section of a biometric identification module according to still yet an embodiment of the invention.
- a biometric identification module 200 F of FIG. 14 is similar to the biometric identification module 200 E of FIG. 13 , and the main difference between the two is that the filter layer 260 can be located between the light guide layer 290 and the light-collimating layer 250 .
- the refractive index between the light-collimating layer 250 and the image-capture device 240 is greater than or equal to 1.
- the biometric identification module of the invention has at least one optical film layer that can transmit a light beam emitted from a light source toward a specific direction to generate total internal reflection in the cover plate or the light guide layer to disperse the light beam in the cover plate or the light guide layer. Accordingly, the issue of hot spots caused by an overly-concentrated distribution of the light beam irradiated on the pressing surface in prior art can be alleviated.
Abstract
Description
- This application is a continuation-in-part application of and claims the priority benefit of U.S. application Ser. No. 15/662,238, filed on Jul. 27, 2017, now allowed, which is a continuation-in-part application of and claims the priority benefit of U.S. application Ser. No. 14/973,686, filed on Dec. 17, 2015, now patented. The prior U.S. application Ser. No. 14/973,686 claims the priority benefits of U.S. provisional application Ser. No. 62/190,267, filed on Jul. 9, 2015, and Taiwan application serial no. 104134209, filed on October 19, 2015. This application also claims the priority benefits of U.S. provisional application Ser. No. 62/563,045, filed on Sep. 25, 2017, U.S. provisional application Ser. No. 62/574,222, filed on Oct. 19, 2017, and China application serial no. 201820172161.2, filed on Feb. 1, 2018. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification.
- The invention relates to an identification module, and more particularly, to a biometric identification module.
- In recent years, fingerprint recognition has been the mainstream technique in biometrics and is extensively applied in various mobile apparatuses, in particular apparatuses having a display screen such as smart phones and tablet computers. Moreover, the current user demand for display screen size is increasing, and a narrow-frame or even frameless display apparatus is expected, which inevitably affects the space of the fingerprint recognition device on the apparatus. Therefore, in order to provide a fingerprint recognition device in a full-size screen, an optical fingerprint recognition technique in which a fingerprint sensing device is disposed below the display device has been proposed.
- However, since an optical fingerprint recognition technique is adopted, a light-emitting device is required to sense fingerprints, but since the light-emitting device is disposed below the display screen, the light-emitting device needs to be adjusted to high intensity to transmit a light beam with sufficient light intensity to the finger. However, when the light intensity of the light-emitting device is high and the light distribution is overly-concentrated, hot spots readily occur to the fingerprint image obtained by the image-capture device, such that the function of fingerprint recognition is substantially compromised.
- The invention provides a biometric identification module having good performance.
- A biometric identification module of the invention includes a light source, a cover plate, a display device, an image-capture device, and a first optical film layer. The light source is configured to emit a light beam. The cover plate has a first region and a second region outside the first region, wherein the light source is located adjacent to the first region of the cover plate. The image-capture device is disposed on the first region of the cover plate and located between the first region of the cover plate and the light source. The light beam emitted by the light source passes through the first optical film layer to be sequentially transmitted in the first region and the second region of the cover plate, and a finger disposed on the second region of the cover plate reflects the light beam from the second region of the cover plate. The light beam reflected by the finger sequentially passes through the second region of the cover plate and the display device to be received by the image-capture device.
- In an embodiment of the invention, the cover plate has a first surface to be pressed by a finger and a second surface opposite to the first surface, and the first optical film layer is disposed on the second surface of the first region of the cover plate.
- In an embodiment of the invention, the biometric identification module further includes a second optical film layer overlapped with the second region of the cover plate and located between the display device and the image-capture device.
- In an embodiment of the invention, a first angle is between the light beam reflected by the finger and passing through the display device that does not enter the second optical film layer and a normal of a light-receiving surface of the image-capture device, a second angle is between the light beam reflected by the finger and passing through the display device and the second optical film layer and the normal of the light-receiving surface of the image-capture device, and the second angle is less than the first angle.
- In an embodiment of the invention, the biometric identification module further includes a light-collimating layer located between the second optical film layer and the image-capture device.
- In an embodiment of the invention, the biometric identification module further includes a filter layer located between the second optical film layer and the light-collimating layer.
- In an embodiment of the invention, the biometric identification module further includes a light-controlling device located between the first optical film layer and the light source.
- In an embodiment of the invention, the biometric identification module further includes a light guide layer disposed on the first region and the second region of the cover plate and disposed between the cover plate and the display device. The first optical film layer is disposed on the light guide layer, and a portion of the light guide layer is located between the first region of the cover plate and the first optical film layer. The third optical film layer is disposed on the light guide layer and located between the second region of the cover plate and the light guide layer, wherein the light beam sequentially passes through the first optical film layer located on the first region of the cover plate, is transmitted to the third optical film layer located on the second region of the cover plate via the light guide layer, passes through the third optical film layer, enters the second region of the cover plate, and is reflected by the finger disposed on the second region of the cover plate.
- In an embodiment of the invention, the first optical film layer and the third optical film layer are spaced apart by a distance, and the first optical film layer to the third optical film layer are formed by a plurality of microstructures.
- Based on the above, since total internal reflection occurs to the light beam in the cover plate or the light guide layer in the biometric identification module of an embodiment of the invention, light beam distribution is uniform, and the issue of hot spots caused by an overly-concentrated distribution of the light beam can be effectively alleviated.
- In order to make the aforementioned and other features and advantages of the invention more comprehensible, several embodiments accompanied with figures are described in detail below.
- The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
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FIG. 1 is a cross section of a biometric identification module according to an embodiment of the invention. -
FIG. 2 is a cross section of a biometric identification module according to an embodiment of the invention. -
FIG. 3 is a cross section of a biometric identification module according to another embodiment of the invention. -
FIG. 4 is a cross section of a biometric identification module of another embodiment shown on the basis of yet another embodiment of the invention. -
FIG. 5 is a cross section of a biometric identification module according to still yet an embodiment of the invention. -
FIG. 6 is a cross section of a biometric identification module according to an embodiment of the invention. -
FIG. 7 is a cross section of a biometric identification module according to an embodiment of the invention. -
FIG. 8 is a cross section of a biometric identification module according to an embodiment of the invention. -
FIG. 9 is a cross section of a biometric identification module according to another embodiment of the invention. -
FIG. 10 is a cross section of a biometric identification module according to yet another embodiment of the invention. -
FIG. 11 is a cross section of a biometric identification module according to an embodiment of the invention. -
FIG. 12 is a cross section of a biometric identification module according to another embodiment of the invention. -
FIG. 13 is a cross section of a biometric identification module according to yet another embodiment of the invention. -
FIG. 14 is a cross section of a biometric identification module according to still yet another embodiment of the invention. - Hereinafter, exemplary embodiments are described with reference to figures. Wherever possible, the same reference numerals are used in the figures and the descriptions to refer to the same or similar parts.
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FIG. 1 is a cross section of a configuration of the biometric identification module according to the first embodiment of the invention. Referring toFIG. 1 , abiometric identification module 100 is suitable for capturing the biometrics of an analyte F. In the present embodiment, the analyte F is, for instance, a finger, and the biometrics are, for instance, a fingerprint or a vein, but the invention is not limited thereto. For instance, in any embodiment, the analyte F can also be a palm, and the biometrics can be a fingerprint, and the invention is not limited in this regard. - Referring to
FIG. 1 , thebiometric identification module 100 includes alight source 110, acover plate 120, adisplay device 130, an image-capture device 140, a first optical film layer MS1, and a second optical film layer MS2. Thelight source 110 is configured to emit a light beam L, and in the present embodiment, the light beam L emitted by thelight source 110 can be visible light beam, invisible light beam, or a combination thereof. - The
cover plate 120 has a first region R1 and a second region R2 outside the first region R1. The second region R2 of thecover plate 120 refers to the region of thecover plate 120 overlapped with thedisplay device 130. In the present embodiment, the first region R1 of thecover plate 120 can refer to the region of thecover plate 120 not overlapped with thedisplay device 130, and thelight source 110 is located adjacent to the first region R1 of thecover plate 120. In the present embodiment, the second region R2 is used as a touch region touched by a finger F, and the first region R1 is located in the periphery of the touch region. In the present embodiment, thecover plate 120 has afirst surface 122 to be pressed by the finger F and asecond surface 124 opposite to thefirst surface 122. For instance, in the present embodiment, the material of thecover plate 120 can be glass, and thecover plate 120 can be referred to as a cover glass. However, the invention is not limited thereto, and in other exemplary embodiments, the material of thecover plate 120 can also be other suitable materials having high transmittance resistant to pressing. - The
display device 130 is overlapped with the second region R2 of thecover plate 120. Thedisplay panel 130 is disposed below thecover plate 120 and located between the second region R2 of thecover plate 120 and the image-capture device 140. In the present embodiment, thedisplay device 130 can include afirst substrate 130 a, asecond substrate 130 b, and adisplay medium layer 132, wherein thedisplay medium layer 132 is disposed between thefirst substrate 130 a and thesecond substrate 130 b. For instance, in the present embodiment, thedisplay medium layer 132 can be an organic light-emitting diode (OLED) layer or a liquid crystal layer, and thedisplay device 130 is, for instance, an OLED or a liquid crystal display (LCD). However, the invention is not limited thereto, and according to other exemplary embodiments, thedisplay device 130 can also be other suitable types of display. - The first optical film layer MS1 is disposed on the first region R1 of the
cover plate 120 and located between the first region R1 of thecover plate 120 and thelight source 110. For instance, in the present embodiment, the first optical film layer MS1 can be an optical film layer disposed on thesecond surface 124 of thecover plate 120. However, the invention is not limited thereto, and according to other embodiments, the first optical film layer MS1 can also be formed on thesecond surface 124 of thecover plate 120; in other words, in other exemplary embodiments, the first optical film layer MS1 and thecover plate 120 can also be integrally-formed. - In the present embodiment, the first optical film layer MS1 is configured to guide the light beam L emitted by the
light source 110 to be transmitted toward a specific direction such that most of the light beam L passing through the first optical film layer MS and entering the first region R1 of thecover plate 120 can be totally reflected by thefirst surface 122 and be transmitted from the first region R1 of thecover plate 120 toward the second region R2 of thecover plate 120. Accordingly, the light beam L emitted by thelight source 110 can be uniformly dispersed on the first surface 122 (i.e., the pressing surface) of the second region R2 to alleviate the issue of hot spots caused by overly-concentrated distribution of the light beam irradiated on the pressing surface in the prior art. - In the present embodiment, the
biometric identification module 100 can further include a second optical film layer MS2. The second optical film layer MS2 is overlapped with the second region R2 of thecover plate 120 and located between thedisplay device 130 and the image-capture device 140. For instance, in the present embodiment, the second optical film layer MS2 can be disposed on an outer surface of thesecond substrate 130 b of thedisplay device 130, but the invention is not limited thereto. - The second optical film layer MS2 has the function of changing the transmission direction of the light beam L. Specifically, a first angle α is between the light beam L reflected by the finger F and passing through the
display device 130 that does not enter the second optical film layer MS2 and a normal N of a light-receivingsurface 142 of the image-capture device 140, a second angle β is between the light beam L reflected by the finger F and passing through thedisplay device 130 and the second optical film layer MS2 and the normal N of the light-receivingsurface 142 of the image-capture device 140, and the second angle β is less than the first angle α. Via the function of the second optical film layer MS2, the image-capture device 140 can obtain a clearer fingerprint image to facilitate fingerprint recognition. -
FIG. 2 is a cross section of a biometric identification module according to an exemplary embodiment of the invention. Thebiometric identification module 100 shown inFIG. 2 is thebiometric identification module 100 shown inFIG. 1 , butFIG. 2 shows a specific first optical film layer MS1 and second optical film layer MS2 of an embodiment. Referring toFIG. 1 andFIG. 2 , in an embodiment, the first optical film layer MS1 and/or the second optical film layer MS2 can be a plurality of prisms. However, the invention is not limited thereto, and in other embodiments, the first optical film layer MS1 and/or the second optical film layer MS2 can also be a plurality of semi-cylinders or other suitable forms of optical microstructures. -
FIG. 3 is a cross section of a biometric identification module according to another embodiment of the invention. Referring toFIG. 1 andFIG. 3 , abiometric identification module 100A ofFIG. 3 is similar to thebiometric identification module 100 ofFIG. 1 , and the main difference between the two is that thebiometric identification module 100A further includes a light-collimating layer 150 and afilter layer 160. - The light-
collimating layer 150 is located between the second optical film layer MS2 and the image-capture device 140. Thefilter layer 160 is located between the second optical film layer MS2 and the light-collimating layer 150. In the present embodiment, the light-collimating layer 150 is configured to transmit the light beam L reflected by the finger F toward the image-capture device 140 in a collimated manner to increase the quality of the fingerprint image obtained by the image-capture device 140. For instance, the light-collimating layer 150 is, for instance, a collimator having a plurality of pinholes, gratings, or fibers, but the invention is not limited thereto. - The
filter layer 160 is configured to filter out ambient light outside the wavelength range of the light beam L. For instance, the light beam L is, for instance, infrared, and thefilter layer 160 can be an IR pass filter layer. However, the invention is not limited thereto, and according to other embodiments, thefilter layer 160 an also be other types of filter layers. -
FIG. 4 is a cross section of a biometric identification module according to yet another exemplary embodiment of the invention. Referring toFIG. 3 andFIG. 4 , abiometric identification module 100B ofFIG. 4 is similar to thebiometric identification module 100A ofFIG. 3 , and the main difference between the two is that in thebiometric identification module 100B ofFIG. 3 , thefilter layer 160 can be located between the second optical film layer MS2 and the light-collimating layer 150. -
FIG. 5 is a cross section of a biometric identification module according to still yet an embodiment of the invention. Referring toFIG. 1 andFIG. 5 , abiometric identification module 100C ofFIG. 5 is similar to thebiometric identification module 100 ofFIG. 1 , and the main difference between the two is that thebiometric identification module 100C further includes a light-controllingdevice 170. Thelight source 170 is located between the first optical film layer MS1 and thelight source 110. In the present embodiment, the light beam L emitted by thelight source 110 passes through the light-controllingdevice 170 and enters the first optical film layer MS1 at a predetermined incident angle. The light-controllingdevice 170 is, for instance, a fiber, but the invention is not limited thereto. The refractive index between the second optical film layer MS2 and the image-capture device 140 is greater than or equal to 1. -
FIG. 6 is a cross section of a biometric identification module according to an embodiment of the invention. Referring toFIG. 3 andFIG. 6 , abiometric identification module 100D ofFIG. 6 is similar to thebiometric identification module 100A ofFIG. 3 , and the main difference between the two is that thebiometric identification module 100D further has a transparentconductive layer 180, the transparentconductive layer 180 is located between thecover plate 120 and thedisplay panel 130, and an air gap can be optionally between the second optical film layer MS2 and the light-collimating layer 150. In the present embodiment, the transparentconductive layer 180 is, for instance, a touch electrode, and can be formed by a single film layer or a plurality of film layers and have a patterned electrode. The refractive index of the transparentconductive layer 180 and the refractive index of an adjacent component (such as thecover plate 120 and thefirst substrate 130 a of the display device 130) can match (such as substantially the same) such that the transmission direction of the light beam L is not readily excessively changed by passing through the transparentconductive layer 180. The refractive index between the second optical film layer MS2 and the light-collimating layer 150 is greater than or equal to 1. -
FIG. 7 is a cross section of a biometric identification module according to an exemplary embodiment of the invention. Referring toFIG. 7 , thebiometric identification module 200 includes alight source 210, acover plate 220, adisplay device 230, an image-capture device 240, alight guide layer 290, a first optical film layer MS1, and a third optical film layer MS3. Thecover plate 220 has a first region R1 and a second region R2 outside the first region R1, wherein thelight source 210 is located adjacent to the first region R1 of thecover plate 220. Thecover plate 220 has afirst surface 222 to be pressed by the finger F and asecond surface 224 opposite to thefirst surface 222. Thelight guide layer 290 is located in the first region R1 and the second region R2 and located on thesecond surface 224. Thedisplay device 230 is overlapped with the second region R2 of thecover plate 220. In the present embodiment, thedisplay device 230 can include afirst substrate 230 a, asecond substrate 230 b, and adisplay medium layer 232, wherein thedisplay medium layer 232 is disposed between thefirst substrate 230 a and thesecond substrate 230 b. Thedisplay device 230 is located in the second region R2 of thecover plate 220 and located between thelight guide layer 290 and the image-capture device 240. The first optical film layer MS1 is disposed in the first region R1 of thecover plate 220 and located between thelight guide layer 290 and thelight source 210. The third optical film layer MS3 is located in the second region R2 of thecover plate 220 and located between thecover plate 220 and thelight guide layer 290. - In the present exemplary embodiment, the first optical film layer MS1 and the third optical film layer MS3 are spaced apart by a distance d, and the first optical film layer MS1 and the third optical film layer MS3 are not overlapped. The light beam L emitted by the
light source 210 passes through the first optical film layer MS1 to enter a portion of thelight guide layer 290 located in the first region R1; the light beam L entering a portion of thelight guide layer 290 located in the first region R1 can be totally reflected by the interface of thecover plate 220 and the light guide layer 290 (i.e., the second surface 224) to be transmitted from a portion of thelight guide layer 290 located in the first region R1 to another portion of thelight guide layer 290 located in the second region R2. When the light beam L is transmitted to the surface of the third optical film layer MS3 located in the second region R2, total reflection is compromised, and the light beam L can pass through the third optical film layer MS3 to be transmitted to the finger F located on the second region R2 of thecover plate 220. The finger F reflects the light beam L from the second region R2 of thecover plate 220. The light beam L reflected by the finger F sequentially passes through the second region R2 of thecover plate 220, thelight guide layer 290, and thedisplay device 230, and is lastly received by the image-capture device 240. - In the present exemplary embodiment, the
light guide layer 290 has a high refractive index. The refractive index of thelight guide layer 290 is greater than the refractive index of thecover plate 220 and the refractive index of thefirst substrate 230 a of thedisplay device 130. Accordingly, the light beam L can be totally reflected by the interface of thelight guide layer 290 and thecover plate 220 and the interface of thelight guide layer 290 and thedisplay device 230 to be transmitted from a portion of thelight guide layer 290 located in the first region R1 to another portion of thelight guide layer 290 located in the second region R2 and be emitted from the place from the location of the third optical film layer MS3. For instance, in the present embodiment, thelight guide layer 290 can be at least one continuous translucent electrode of a touch sensing structure, but the invention is not limited thereto. - It should be mentioned that, the
biometric identification module 200 of the present embodiment guides the light beam L emitted by thelight source 210 to the second region R2 of thecover plate 220 using thelight guide layer 290 located below thecover plate 220 such that the light beam L is uniformly irradiated on the finger F. In comparison to the embodiment ofFIG. 1 in which the light beam L is transmitted using thecover plate 120 itself, thebiometric identification module 200 of the present embodiment can prevent dirt on thefirst surface 222 of thecover plate 220 or damage of thefirst surface 222 from affecting the amount of the light beam L transmitted to the second region R2. Therefore, in comparison to the embodiment ofFIG. 1 , in addition to improving the issue of hot spots, thebiometric identification module 200 of the present embodiment also has the advantage of good light utilization efficiency. -
FIG. 8 is a cross section of a biometric identification module according to an embodiment of the invention. Thebiometric identification module 100 shown inFIG. 8 is thebiometric identification module 200 shown inFIG. 7 , butFIG. 8 shows a specific first optical film layer MS1 and third optical film layer MS3 of an embodiment. Referring toFIG. 7 andFIG. 8 , in an embodiment, the first optical film layer MS1 and/or the third optical film layer MS3 can be a plurality of prisms. However, the invention is not limited thereto, and in other exemplary embodiments, the first optical film layer MS1 and/or the third optical film layer MS3 can also be a plurality of semi-cylinders or other suitable forms of optical microstructures. -
FIG. 9 is a cross section of a biometric identification module according to another embodiment of the invention. Referring toFIG. 7 andFIG. 9 , abiometric identification module 200A ofFIG. 9 is similar to thebiometric identification module 200 ofFIG. 7 , and the main difference between the two is that thebiometric identification module 200A further includes a second optical film layer MS2 located in the second region R2 of thecover plate 220 and located between thedisplay device 230 and the image-capture device 240. The refractive index between the second optical film layer MS2 and the image-capture device 240 is greater than or equal to 1. -
FIG. 10 is a cross section of a biometric identification module according to yet another exemplary embodiment of the invention. Referring toFIG. 7 andFIG. 10 , abiometric identification module 200B ofFIG. 10 is similar to thebiometric identification module 200 ofFIG. 7 , and the main difference between the two is that thebiometric identification module 200B further includes a light-collimating layer 250, afilter layer 260, and an adhesive layer AD. The light-collimating layer 250 is located between thedisplay device 230 and thefilter layer 260, and thefilter layer 260 is located between the light-collimating layer 250 and the image-capture device 240. The adhesive layer AD is located between thefilter layer 260 and the image-capture device 240. Thefilter layer 260 can be fixed on the image-capture device 240 using the adhesive layer AD. In the present embodiment, the adhesive 260 can be, for instance, an optically-clear adhesive (OCA), an optically-clear resin (OCR), or a thermal adhesive, but the invention is not limited thereto. -
FIG. 11 is a cross section of a biometric identification module according to an exemplary embodiment of the invention. Referring toFIG. 11 , abiometric identification module 200C includes alight source 210, acover plate 220, adisplay device 230, an image-capture device 240, alight guide layer 290, a first optical film layer MS1, and a third optical film layer MS3. Thecover plate 220 has a first region R1 and a second region R2 outside the first region R1, wherein thelight source 210 is located adjacent to the first region R1 of thecover plate 220. Thecover plate 220 has afirst surface 222 to be pressed by the finger F and asecond surface 224 opposite to thefirst surface 222. Thedisplay device 230 is located in the first region R1 and the second region R2 of thecover plate 220. In the present embodiment, thedisplay device 230 can include afirst substrate 230 a, asecond substrate 230 b, and adisplay medium layer 232, wherein thedisplay medium layer 232 is disposed between thefirst substrate 230 a and thesecond substrate 230 b. Thelight guide layer 290 is located in the first region R1 and the second region R2 of thecover plate 220, and thedisplay device 230 is located between thecover plate 220 and thelight guide layer 290. The first optical film layer MS1 is disposed in the first region R1 of thecover plate 220 and located between thelight guide layer 290 and thelight source 210. The third optical film layer MS3 is located in the second region R2 of thecover plate 220 and located between thedisplay device 230 and thelight guide layer 290. - In the present embodiment, the first optical film layer MS1 and the third optical film layer MS3 are spaced apart by a distance d, and the first optical film layer MS1 and the third optical film layer MS3 are not overlapped. The light beam L emitted by the
light source 210 passes through the first optical film layer MS1 to enter a portion of thelight guide layer 290 located in the first region R1. The light beam L entering a portion of thelight guide layer 290 located in the first region R1 can be totally reflected by the interface of thesecond substrate 230 b and thelight guide layer 290 to be transmitted from a portion of thelight guide layer 290 located in the first region R1 to another portion of thelight guide layer 290 located in the second region R2. When the light beam L is transmitted to the surface of the third optical film layer MS3 located in the second region R2, total reflection is compromised, and the light beam L can pass through the third optical film layer MS3 and thedisplay device 230 to be transmitted to the finger F located on the second region R2 of thecover plate 220. The finger F reflects the light beam L from the second region R2 of thecover plate 220. The light beam L reflected by the finger F sequentially passes through the second region R2 of thecover plate 220, thedisplay device 230, and thelight guide layer 290, and is lastly received by the image-capture device 240. - In the present exemplary embodiment, the
light guide layer 290 has a high refractive index. The refractive index of thelight guide layer 290 is greater than the refractive indices of thesecond substrate 230 b of thedisplay device 230 and an environmental media (such as air). Accordingly, the light beam L can be totally reflected by the interface of thelight guide layer 290 and the interface of thesecond substrate 230 b and thelight guide layer 290 and an environmental medium (such as air) to be transmitted from a portion of thelight guide layer 290 located in the first region R1 to another portion of thelight guide layer 290 located in the second region R2 and be emitted from the place from the location of the third optical film layer MS3. For instance, in the present embodiment, thelight guide layer 290 can be one continuous translucent electrode of a touch sensing structure, but the invention is not limited thereto. -
FIG. 12 is a cross section of a biometric identification module of another exemplary embodiment of the invention. Referring toFIG. 11 andFIG. 12 , abiometric identification module 200D ofFIG. 12 is similar to thebiometric identification module 200C ofFIG. 11 , and the main difference between the two is that thebiometric identification module 200D further includes a second optical film layer MS2 located in the second region R2 of thecover plate 220 and located between thedisplay device 230 and the image-capture device 240. -
FIG. 13 is a cross section of a biometric identification module of yet another exemplary embodiment of the invention. Referring toFIG. 11 andFIG. 13 , abiometric identification module 200E ofFIG. 13 is similar to thebiometric identification module 200C ofFIG. 11 , and the main difference between the two is that thebiometric identification module 200E further includes a light-collimating layer 250 and afilter layer 260. The light-collimating layer 250 is in the second region R2 of thecover plate 220 and located between thelight guide layer 290 and thefilter layer 260, and thefilter layer 260 is located between the light-collimating layer 250 and the image-capture device 240. The refractive index between thefilter layer 260 and the image-capture device 240 is greater than or equal to 1. -
FIG. 14 is a cross section of a biometric identification module according to still yet an embodiment of the invention. Referring toFIG. 13 andFIG. 14 , abiometric identification module 200F ofFIG. 14 is similar to thebiometric identification module 200E ofFIG. 13 , and the main difference between the two is that thefilter layer 260 can be located between thelight guide layer 290 and the light-collimating layer 250. The refractive index between the light-collimating layer 250 and the image-capture device 240 is greater than or equal to 1. - Based on the above, the biometric identification module of the invention has at least one optical film layer that can transmit a light beam emitted from a light source toward a specific direction to generate total internal reflection in the cover plate or the light guide layer to disperse the light beam in the cover plate or the light guide layer. Accordingly, the issue of hot spots caused by an overly-concentrated distribution of the light beam irradiated on the pressing surface in prior art can be alleviated.
- Although the invention has been described with reference to the embodiments thereof, it will be apparent to one of the ordinary skills in the art that modifications to the described embodiments may be made without departing from the spirit of the invention. Accordingly, the scope of the invention will be defined by the attached claims not by the above detailed description.
Claims (19)
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